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LEGO Heavy Duty Excavator vs LEGO Excavator | LEGO 42121 vs 42006 | LEGO 42006 vs 42121 | Compare - YouTube
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Turning lego set 42121 into a crawler crane, I'm waiting for more parts, but this is what I have so far! : r/legotechnic
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Lego 42121 - C model Bulldozer - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
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MOD] 42121 Compact Excavator - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
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